Quartus 13.1,Qsys Generation Error only with PLL

Hi,

i am using Quartus Version 13.1 and i cannot instantiate a PLL anymore.

When i try in Qsys i get the following error:

Error: 
    while executing
"__altera__safe_load C:/altera/13.1/quartus/bin/qcl_pll_tcl.dll generic_pll"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 
"
    (procedure "load" line 2)
    invoked from within
"load  generic_pll"
    ("windows" arm line 2)
    invoked from within
"switch $tcl_platform(platform) {
        windows {
            load  generic_pll
        }
        unix {
            load [file join $::qu..."
    ("package ifneeded ::altera::generic_pll 1.0" script)
    invoked from within
"package require ::altera::generic_pll"
Error: An instance of Altera PLL could not be created.
The component had an unexpected internal error.

In Quartus the MegaWirazd shows the blue loading module window but then just disappears.

Is it possible that i have a corrupt pll design file in my system? Or is there something else wrong?

Regards

Tim